Other
What is the difference between a sounding bar and a probing bar?
If a trench is greater than _____ feet deep, a registered professional engineer must design the system.
What is 20
True or False: In a layered system, soil will be classified as the strongest layer.
What is false
Removal will begin at, and progress from, the ______ of the excavation.
What is the bottom
Equipment, materials and trench spoils shall not be stored within ___ feet of the edge of the trench.
What is 2
A _________ is an example of a portable device used for shielding.
What is a Trench (Build-A) Box
A competent person is responsible for determining the soil classification based on what two tests?
What are visual and manual
A soil cannot be classified as Type A if _________, ___________, or _________.
a) it is fissured b) subject to vibration c) previously disturbed.
A soil Type B excavation of less than 20 ft deep can be sloped at a _to_ (horizontal to vertical) or ___ degree
What is 1:1
What is 45 degrees
Daily inspections should look for 1)_____ 2)______ 3)______ and 4)_______.
What is 1) shoring requirements 2) water accumulation 3) undermining 4) sloughing
Protective systems shall be maintained ________ by the manufacturer.
What is annually
What are: Daily, throughout the shift, and after conditions change (rainstorm) or due to other hazardous condition.
Name 3 types of manual soil analysis.
What is 1) plasticity (cohesiveness) 2)dry strength 3) thumb penetration
A soil Type C excavation of less than 20 ft deep can be sloped at a _to_ (horizontal to vertical) or ___ degrees.
What is 1 1/2 to 1
What is 34 degrees
An oxygen deficient atmosphere contains ____ than ____ % oxygen.
What is less than 19.5
Warning systems for mobile equipment include 1) _______, 2) ________, and 3) _______.
What are: 1) barricades 2) hand or mechanical signals 3) stop logs
A competent person as defined by OSHA is one who is ___________ of identifying existing hazards and one who has the ___________ to take prompt measures to abate the hazards.
What is CAPABLE and AUTHORITY
Type B soil descriptions are 1)______ 2)______
3)______
What is 1) silt 2) sandy loam 3) medium clay
If a trench is between 5 ft. and 20 ft. deep the competent person may select from Sloping and Benching, _______ and Shielding as acceptable protective measures.
What is SHORING
A stairway, ladder, or ramp will be located in excavations 4 feet or more in depth every ____ lateral feet.
What is 25
Employees performing copper pulls must wear ASTM approved _____ KV high voltage insulating gloves with leather over-gloves when handling the cable or pipe.
What is 20 KV
A competent person may determine a trench less than 4 feet may require a protective system if there are signs of 1)______ 2)_______or 3)________.
What are 1) water 2) vibrations 3) previous disruption.
Type C can be described as: 1)______ 2)_______
3)_______ 4)________
What is 1) gravel 2) loamy sand 3) soft clay 4) previous disturbed
Shields shall extend _____ above the vertical top of the trench or excavation face.
What is 18 inches
What is the stop-work criterion for hydrocarbons?
What is 10 ppm for 1 minute